Glow for FB: reliable Facebook Notifications on OS X 10.6 to 10.8.
It notifies you as soon as something's happened on Facebook, so you don't have to check.
It helps staying away from Facebook as long as possible and being productive instead.
If you click on the glowing dot, you'll be redirected to Facebook (try it). Access the settings menu in the none-glowing state. It's that simple.
Version 1.0.5 (incl. custom sounds) is available! Download via AppStore